[Auto] Implement Create Todo endpoint (POST /todos)

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+# Implement Create Todo endpoint (POST /todos)
+
+Implement POST /todos to create a new Todo item. Request body must contain `title` (string, non-empty). Response should be 201 Created with the full Todo object.
+
+Acceptance Criteria:
+- Returns 201 and the created Todo on success
+- Returns 400 if title is missing, null, or empty string
+- createdAt and updatedAt are set automatically
+
+Test Cases:
+- Integration: POST /todos with { "title": "Buy milk" } returns 201 and a Todo object with id, title, completed=false, createdAt, updatedAt
+- Integration: POST /todos with { "title": "" } returns 400 with JSON error
+- Integration: POST /todos with {} returns 400 with JSON error
+- Edge: POST /todos with extra fields ignores them and still creates the Todo
+
+Please implement this fix.